"Horrific incident in our community," tweeted Chattanooga Mayor Andy Berke. "We will release details as they are confirmed. Prayers to all those affected."

Jackson said paramedics were standing by but had not transported anyone at this time.

Photos posted on Twitter by media outlets showed police blocking a road and a large number of patrol cars.

Horrific incident in our community. We will release details as they are confirmed. Prayers to all those affected

— Andy Berke (@AndyBerke) July 16, 2015
A witness told CNN that she saw a man with "a high-powered rifle" fire multiple shots from a silver Mustang. She said she was watching through a window from inside a restaurant.

Gina Mule said she heard "Pow, pow, pow!" around 10:50 a.m. ET.

"I don't know how many shots he fired, but it was a lot," she said.

Chattanooga State University asked people on its main campus to stay inside because of a "confirmed shooting," the school said on Twitter.

"Horrific incident in our community," tweeted Chattanooga Mayor Andy Berke. "We will release details as they are confirmed. Prayers to all those affected."

Jackson said paramedics were standing by but had not transported anyone at this time.

Photos posted on Twitter by media outlets showed police blocking a road and a large number of patrol cars.

Horrific incident in our community. We will release details as they are confirmed. Prayers to all those affected

— Andy Berke (@AndyBerke) July 16, 2015
A witness told CNN that she saw a man with "a high-powered rifle" fire multiple shots from a silver Mustang. She said she was watching through a window from inside a restaurant.

Gina Mule said she heard "Pow, pow, pow!" around 10:50 a.m. ET.

"I don't know how many shots he fired, but it was a lot," she said.

Chattanooga State University asked people on its main campus to stay inside because of a "confirmed shooting," the school said on Twitter.

"There has been several (shootings) at several different locations. It's a fluid situation," John Harmon, a spokesman for the Tennessee Highway Patrol, told Reuters. It is not known if the shootings are related.